Table 2 Overview of trace clustering (in total 6 classes containing 2 to 8 traces)
Cluster | Sample IDs | Commonalities | Believed origin |
|---|---|---|---|
1 | 1, 3, 4.1, 4.2, 5, 6.1, 6.3, 7 | Brown, flaky, transparent | Organic |
2 | 8.1, 8.2, 9.4, 9.5, 9.6, 9.7, 9.8, 9.9 | Hair root, cylindrical | Organic—Human |
3 | 8.4, 8.8, 9.3 | Hair root, continuous medulla, oval | Organic—Human |
4 | 8.7, 9.1 | Frayed hair root, spinous scales, uniserial ladder | Organic—Animal |
5 | 8.3, 8.9 | Fibrous, shiny, transparent, homogenous | Inorganic |
6 | 3, 6.2 | Textile-like | Organic—Plant |
Remaining: 2, 4.3, 4.4, 4.5, 4.6, 6.3, 8.5, 8.6, 9.2 | Various origin | ||